But aren't they family now?
Wedding reveling for the Duke and Duchess of Cambridge is still going on, but Facebook fans want to see another royal hook-up -- their siblings!
Just hours after the royal wedding Friday, the group had more than 30,000 members, whose wall posts ranged from the sweet -- "They make a fantastic couple" -- to the vulgar.
While Harry is still linked to on-again-off-again girlfriend Chelsy Davy (who attended the wedding), the Facebook fans might not be that far off; during the ceremony, Harry spent much of his time by Pippa's side and even managed to make the maid of honor laugh.
Commemorate Will & Kate's big day with our Us Collectors Edition: Royal Wedding with all the photos, anecdotes and details from the wedding. Available for pre-order now and on sale May 6.